The FBI has the e-mails of nearly all US citizens, including congressional members, according to NSA whistleblower William Binney. Speaking to RT he warned that the government can use information against anyone it wants.
One of the best mathematicians and code breakers in NSA history resigned in 2001 because he no longer wanted to be associated with alleged violations of the constitution.
He asserts, that the FBI has access to this data due to a powerful device Naris.
Source: RT. Read full article. (link)